Q. What is the data format?

A. Both tick and OHLCV data files are gzipped pipe-delimited text files.
For the tick data the format is:

#	Name	Sample	Meaning
1	Trade ID	148786	Unique trade ID for this particular pair
2	Price	0.02234	Price of base asset in quote currency
3	Volume	12268.7	Number of base assets traded
4	Timestamp	1564979285094	Unix timestamp, in milliseconds
5	Buy Side	0	1 if it was BUY, otherwise - SELL

For the 1-minute OHLCV data the format is:

#	Name	Sample	Meaning
1	Open timestamp	1564976880	Unix timestamp of the bar
2	Open	11522.85	Price in quote asset (USDT here)
3	High	11528.86
4	Low	11514.00
5	Close	11514.00
6	Volume	26.260843	Volume traded, in base asset (BTC)
7	Taker Buy Quote Asset Volume	89577.598002
8	Taker Buy Base Asset Volume	7.773834
9	Quote Asset Volume	302565.699237	Volume traded, in quote asset (USDT)
10	Number of trades	304	Trades occurred

A general advice is to ignore all volumes other than the traded ones.

Q. What is the source of data?

A. The data is from Binance.

Q. How fresh is the data?

A. The data is updated daily.

Q. Once I'll have the access will I need to pay for the updates?

A. No, you can download the freshest version as soon as it appears.

Q. Is it possible to download the data myself?

A. Yes, you can use publicly available Binance API. You will need to code a API client to fetch the data. Please keep in mind it will take quite some time to download the data due to fully understandable API request limits.